package com.deewin.study.mycollections;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        Map m = new HashMap();
        m.put("k","v");
        m.put("K1","v1");

        Map map = Collections.synchronizedMap(m);

    }
}
